Select all true statements the formula mass of n2o5 is 10802...

Select all true statements. The formula mass of N2O5 is 108.02 g. The formula mass of CaO is also correctly referred to as the molecular mass. The formula mass of PCl3 is the same as its molecular mass. The formula mass of a chlorine molecule is 35.45 amu. The formula mass of potassium is 19 amu.

Transcript

0:00 Hello everyone.

00:01 Let's start the question.

00:03 In this question we are given with a sample of a compound for which we have the molar mass of the compound given as 34 grams per mole.

00:12 Also we are given with the mass of the elements present in that compound.

00:16 One is hydrogen which has the mass as 0 .44 grams and oxygen which has 6 .92 grams present.

00:24 We need to determine the molecule of formula for this compound.

00:27 So in order to determine the molecular formula, first we need to calculate the percentage composition of the different elements present.

00:36 So from this, if we see, we can determine the total mass of the elements present in the sample, which would be equal to mass of hydrogen, that is 0 .44 grams, added to the mass of oxygen, which is 6 .92 grams.

00:57 If we carry out the addition, it will be equal to 7 .36 grams.

01:05 Now from this we will be determining the percentage composition of the element.

01:11 Now starting from the percentage composition of the element hydrogen, it will be equal to the given mass that is 0 .44 grams divided by the total mass of element which is 7 .36, multiplied by 100 percentage.

01:32 If we carry out this simplification, it will be equal to 5 .97 percentage.

01:41 So this is the percentage composition that we have obtained for hydrogen.

01:46 Now let's move further and determine the percentage composition of the element oxygen.

01:57 This again would be equal to its given mark.

02:00 Which is 6 .92 grams divided by the total mass which is 7 .36 multiplied by 100 percentage.

02:09 If we carry out the further simplification, it will be equal to 94 .03 percentage.

02:18 In this manner we have determined the percentage composition of both the elements present.

02:24 Now we have the percentage composition.

02:26 We will be determining the empirical formula.

02:29 So for empirical formula for determining the empirical formula of the sample given, we need to make a table by specifying few important things.

02:51 On the left side we will specify the element which are present.

02:58 Then elements, we have two elements.

03:01 One is hydrogen and the other element is oxygen...

Question

Select all true statements. The formula mass of N2O5 is 108.02 g. The formula mass of CaO is also correctly referred to as the molecular mass. The formula mass of PCl3 is the same as its molecular mass. The formula mass of a chlorine molecule is 35.45 amu. The formula mass of potassium is 19 amu.

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